Siemens XMS-S Single Action Pull StationThe Siemens XMS S is an addressable single action manual pull station with a built in loop isolator for Class X (Style 7) survivability. It features a high impact polycarbonate housing, a tri color status LED for normal, alarm, and trouble, and Siemens T 45 key for quick, secure reset. The device can be configured for isolation mode or polarity insensitive wiring in non isolation mode, and it occupies a single address on the loop. Also known as P N